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AGUS ROHYADI
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Medicine & Pharmacology

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Growth Responses of External Hyphae of Arbuscular Mycorrhizal Fungi to Acidic Soil Conditions and their Effects on Cowpea Growth AGUS ROHYADI
Microbiology Indonesia Vol. 2 No. 1 (2008): April 2008
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (103.591 KB) | DOI: 10.5454/mi.2.1.5

Abstract

The effectiveness of arbuscular mycorrhizal (AM) fungi has often been attributed to growth of their external hyphae, whilst the hyphae themselves may be subjected to the effects of severe soil conditions. The growth of external hyphae of Gigaspora margarita and Glomus etunicatum and their functions in cowpea growth have been studied at low soil pH using a pot system making is possible for the hyphae to grow separately from their host’s roots. Pots had two compartments, one for roots (RC) and one for hyphae (HC). The RC was a cylindrical bag made of 30 ìm nylon mesh that retains the roots but allows the hyphae to pass through, placed centrally and surrounded by the HC. Initially, the RC was filled with 120 g of a soil/sand mixture (pH 5.3), inoculated with G. margarita, G. etunicatum or free fungal inoculants. A pre-germinated cowpea seed was grown in the compartment for two weeks before the HC was filled with 580 g of the mix in which the pH had been adjusted to 4.6, 4.9 or 5.2. Growth of the plants and of the fungal hyphae in the HC was assessed 6 weeks later. The two fungi differed in their responses to soil pH levels in their growth of external hyphae although they colonized plant roots in the same way. At pH 4.6, the hyphae of G. etunicatum grew more weakly than those of G. margarita. Increasing the pHenhanced the growth of G. etunicatum’s hyphae but reduced G. margarita’s. In relation to their external hyphal functions, G. margarita was able to improve its shoot dry weight and P uptake of cowpea plants higher than G. etunicatum. These findings highlight the ability of developing an extensive external hyphal network under adverse conditions of excessive H+ ions as an important characteristic for theeffectiveness of AM fungi in acidic soils.
Neighboring Plants Alleviate Aluminum Toxicity on The External Hyphae of Gigaspora margarita AGUS ROHYADI
Microbiology Indonesia Vol. 3 No. 1 (2009): April 2009
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (81.739 KB) | DOI: 10.5454/mi.3.1.8

Abstract

Excessive soluble aluminum (Al3+) in acidic soils is toxic to the external hyphae of arbuscular mycorrhizal fungi but it can be alleviated by other soil factors. A glasshouse experiment was conducted to study the effect of increased Al3+ concentration on the growth of the external hyphae of Gigaspora margarita in the presence of other plants near the host plants. The experiment used compartmentalized pots to facilitate the growth of mycorrhizal-inoculated host plants, external hyphae of the fungus and not mycorhizal-inoculated neighboring plants in different compartments; and measuring the effects of Al3+ and of the neighboring plants on the growth of the fungal hyphae independently. Increased concentration of Al3+ in soil affected the growth of external hyphae of G. margarita negatively. However, the hyphal length density of the fungus was much higher in the pots with neighboring plants than that in the other ones, despite the Al toxicity. This indicates that the hyphae could be taken away from the toxic effect of Al3+ by the stimulating growth from roots of the neighboring plants.
PENGARUH JENIS DAN KONSENTRASI AIR KELAPA SEBAGAI PERENDAM BlBIT TERHADAP PERTUMBUHAN RUMPUT LAUT Eucheuma cottonii Megawati Megawati; Agus Rohyadi; Salnida Yuniarti Lumbessy
Jurnal Perikanan Unram Vol 3 No 2 (2013): Jurnal Perikanan Unram
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jp.v3i2.36

Abstract

Rumput laut merupakan salah satu sumber hayati laut yang memiliki nilai ekonomis tinggi. Penelitian ini bertujuan untuk mengetahui pengaruh jenis dan konsentrasi air kelapa sebagai perendam bibit terhadap pertumbuhan rumput laut E.cottonii. Metode penelitian yang digunakan adalah metode eksperimental dengan melakukan percobaan di lapangan (laut) tempat pembudidayaan rumput laut. Percobaan ini merupakan percobaan faktorial yang terdiri dari dua faktor perlakuan dan empat kelompok. Faktor perlakuan tersebut meliputi: faktor 1 (Jenis Kelapa) yang terdiri dari J1 = jenis kelapa muda dan J2, = jenis kclapa tua. Faktor II (Konsentrasi Air Kelapa dalam Larutan) yairu K = Kontrol konsentrasi 0%, K1 = Konsentrasi 25%, K2 = Konsentrasi 50%, K3 = Konsentrasi 75%, dan K4 = Konsentrasi 100%. Hasil penelitian mcnunjukkan bahwa perlakuan perendaman bibit rumput laut menggunakan air kelapa mernberikan pengaruh yang nyata terhadap pertumbuhan rumput laut. E. cottonii. Konsentrasi air kelapa 25% mcmberikan pengaruh paling signiflkan dengan jumlah produksi rumput laut lebih besar 5 kali lipat.
Co-Authors Lumbessy, Salnida Yuniarti Megawati Megawati